I designed some upgrades for Transformers Legacy Laser Optimus Prime, the links to each of them will be below if anyone wants to 3D print them:

1: Missile Launcher Kit that converts Prime's trailer into two giant missile launchers for him to wield, along with a stand-by sentry turret:
https://cults3d.com/en/3d-model/gadget/missile-launcher-kit-for-legacy-laser-optimus-prime

2: G2 Knees that improve the robot mode proportions and don't affect the alt mode:
https://cults3d.com/en/3d-model/various/g2-knees-for-legacy-laser-optimus-prime

3: Weaponized Gas Tanks that bulk out his legs and add more missiles to the sides, along with more detail in alt mode:
https://cults3d.com/en/3d-model/various/weaponized-gas-tanks-for-legacy-laser-optimus-prime